Mr. Voice is an interface between a database of songs, an audio player, and audio files. It is designed for shortform improv shows, such as ComedySportz, and is intended to make playing the right bit of audio as fast as your brain.
First developed in the early 2000s, it is in desparate need of a rewrite. Until that happens, though, there are builds available for Windows and Mac that still work.
Feel free to email Wade if you have any questions, or to download a more complete Mr. Voice kit (songs and a populated database).